diff options
Diffstat (limited to 'arch/x86/kernel/apic/x2apic_cluster.c')
| -rw-r--r-- | arch/x86/kernel/apic/x2apic_cluster.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c index bde78d0098a4..c88baa4ff0e5 100644 --- a/arch/x86/kernel/apic/x2apic_cluster.c +++ b/arch/x86/kernel/apic/x2apic_cluster.c @@ -209,13 +209,30 @@ static int x2apic_cluster_probe(void) return 0; } +static const struct cpumask *x2apic_cluster_target_cpus(void) +{ + return cpu_all_mask; +} + /* * Each x2apic cluster is an allocation domain. */ static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask, const struct cpumask *mask) { - cpumask_and(retmask, mask, per_cpu(cpus_in_cluster, cpu)); + /* + * To minimize vector pressure, default case of boot, device bringup + * etc will use a single cpu for the interrupt destination. + * + * On explicit migration requests coming from irqbalance etc, + * interrupts will be routed to the x2apic cluster (cluster-id + * derived from the first cpu in the mask) members specified + * in the mask. + */ + if (mask == x2apic_cluster_target_cpus()) + cpumask_copy(retmask, cpumask_of(cpu)); + else + cpumask_and(retmask, mask, per_cpu(cpus_in_cluster, cpu)); } static struct apic apic_x2apic_cluster = { @@ -229,7 +246,7 @@ static struct apic apic_x2apic_cluster = { .irq_delivery_mode = dest_LowestPrio, .irq_dest_mode = 1, /* logical */ - .target_cpus = online_target_cpus, + .target_cpus = x2apic_cluster_target_cpus, .disable_esr = 0, .dest_logical = APIC_DEST_LOGICAL, .check_apicid_used = NULL, |